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  • 1.  Power analysis for spearman rho

    Posted Mon May 03, 2021 09:44 AM
    Hi, I want to conduct a power analysis for spearman, and reading some instructions here: Power Analysis of One-Sample Spearman Correlation Test
    I have been asked to input a power for sample size estimation value. The value must be a single value between 0 and 1. Does this mean the rho value I would consider a good finding such as >0.7? Thank you

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    Joe Tookles
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    #SPSSStatistics


  • 2.  RE: Power analysis for spearman rho

    IBM Champion
    Posted Mon May 03, 2021 09:56 AM
    The power is the probability of detecting an effect given a sample size and the hypothesized correlation.  So, if you want a power of .8 when the true correlation is ,2, you would enter .8 in the Power field and .2 for the Spearman correlation.   That gives a required N of 198 for a null of 0.

    If the true correlation is .5, you would only need an N of 33.



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